diff --git a/tests/test_cuquantum_cutensor_backend.py b/tests/test_cuquantum_cutensor_backend.py
index 6344843..19a81a8 100644
--- a/tests/test_cuquantum_cutensor_backend.py
+++ b/tests/test_cuquantum_cutensor_backend.py
@@ -7,6 +7,7 @@ from qibo import construct_backend, hamiltonians
 from qibo.models import QFT
 from qibo.symbols import X, Z
 
+ABS_TOL = 1e-7
 
 def qibo_qft(nqubits, swaps):
     circ_qibo = QFT(nqubits, swaps)
@@ -165,7 +166,7 @@ def test_expectation(nqubits: int, dtype="complex128"):
     }
     backend.configure_tn_simulation(computation_settings_1)
     result_tn = backend.execute_circuit(circuit=qibo_circ)
-    assert math.isclose(exact_expval.item(), result_tn.real.get().item(), abs_tol=1e-7)
+    assert math.isclose(exact_expval.item(), result_tn.real.get().item(), abs_tol=ABS_TOL)
 
     # Test with user defined hamiltonian using "hamiltonians.SymbolicHamiltonian" object.
     computation_settings_2 = {
@@ -176,7 +177,7 @@ def test_expectation(nqubits: int, dtype="complex128"):
     }
     backend.configure_tn_simulation(computation_settings_2)
     result_tn = backend.execute_circuit(circuit=qibo_circ)
-    assert math.isclose(exact_expval.item(), result_tn.real.get().item(), abs_tol=1e-7)
+    assert math.isclose(exact_expval.item(), result_tn.real.get().item(), abs_tol=ABS_TOL)
 
     # Test with user defined hamiltonian using Dictionary object form of hamiltonian.
     ham_dict = build_observable_dict(nqubits)
@@ -188,4 +189,4 @@ def test_expectation(nqubits: int, dtype="complex128"):
     }
     backend.configure_tn_simulation(computation_settings_3)
     result_tn = backend.execute_circuit(circuit=qibo_circ)
-    assert math.isclose(exact_expval.item(), result_tn.real.get().item(), abs_tol=1e-7)
+    assert math.isclose(exact_expval.item(), result_tn.real.get().item(), abs_tol=ABS_TOL)
diff --git a/tests/test_cuquantum_cutensor_mpi_backend.py b/tests/test_cuquantum_cutensor_mpi_backend.py
index 14eb494..0e2fcef 100644
--- a/tests/test_cuquantum_cutensor_mpi_backend.py
+++ b/tests/test_cuquantum_cutensor_mpi_backend.py
@@ -10,6 +10,7 @@ from qibo import construct_backend, hamiltonians
 from qibo.models import QFT
 from qibo.symbols import X, Z
 
+ABS_TOL = 1e-7
 
 def qibo_qft(nqubits, swaps):
     circ_qibo = QFT(nqubits, swaps)
@@ -118,7 +119,7 @@ def test_expectation_mpi(nqubits: int, dtype="complex128"):
     if backend.rank == 0:
         # Compare numerical values
         assert math.isclose(
-            exact_expval.item(), float(result_tn[0]), abs_tol=1e-7
+            exact_expval.item(), float(result_tn[0]), abs_tol=ABS_TOL
         ), f"Rank {backend.rank}: mismatch, expected {exact_expval}, got {result_tn}"
 
     else:
@@ -142,7 +143,7 @@ def test_expectation_mpi(nqubits: int, dtype="complex128"):
     if backend.rank == 0:
         # Compare numerical values
         assert math.isclose(
-            exact_expval.item(), float(result_tn[0]), abs_tol=1e-7
+            exact_expval.item(), float(result_tn[0]), abs_tol=ABS_TOL
         ), f"Rank {backend.rank}: mismatch, expected {exact_expval}, got {result_tn}"
 
     else:
@@ -167,7 +168,7 @@ def test_expectation_mpi(nqubits: int, dtype="complex128"):
     if backend.rank == 0:
         # Compare numerical values
         assert math.isclose(
-            exact_expval.item(), float(result_tn[0]), abs_tol=1e-7
+            exact_expval.item(), float(result_tn[0]), abs_tol=ABS_TOL
         ), f"Rank {backend.rank}: mismatch, expected {exact_expval}, got {result_tn}"
 
     else:
@@ -251,7 +252,7 @@ def test_expectation_NCCL(nqubits: int, dtype="complex128"):
     if backend.rank == 0:
         # Compare numerical values
         assert math.isclose(
-            exact_expval.item(), float(result_tn[0]), abs_tol=1e-7
+            exact_expval.item(), float(result_tn[0]), abs_tol=ABS_TOL
         ), f"Rank {backend.rank}: mismatch, expected {exact_expval}, got {result_tn}"
 
     else:
@@ -275,7 +276,7 @@ def test_expectation_NCCL(nqubits: int, dtype="complex128"):
     if backend.rank == 0:
         # Compare numerical values
         assert math.isclose(
-            exact_expval.item(), float(result_tn[0]), abs_tol=1e-7
+            exact_expval.item(), float(result_tn[0]), abs_tol=ABS_TOL
         ), f"Rank {backend.rank}: mismatch, expected {exact_expval}, got {result_tn}"
 
     else:
@@ -300,7 +301,7 @@ def test_expectation_NCCL(nqubits: int, dtype="complex128"):
     if backend.rank == 0:
         # Compare numerical values
         assert math.isclose(
-            exact_expval.item(), float(result_tn[0]), abs_tol=1e-7
+            exact_expval.item(), float(result_tn[0]), abs_tol=ABS_TOL
         ), f"Rank {backend.rank}: mismatch, expected {exact_expval}, got {result_tn}"
 
     else: